Heat-insulating paper cup

Abstract

A heat-insulating paper cup has a cup body with a conical cylindrical wall, a cup bottom and a cup rim. A glued heat-insulating tube has its inner wall sleeved onto the exterior of the conical cylindrical wall of the cup body. The heat-insulating tube and the conical cylindrical wall of the cup body are adhered securely by glue. The heat-insulating tube is of conical cylindrical shape and mated with the conical cylindrical wall. Moreover, the external wall of the heat-insulating tube is configured to have a smooth surface. Multiple raised lines are protruded at interval onto the inner wall of the heat-insulating tube, and mated with the conical cylindrical wall of the cup body. Multiple hollow ducts are set into the heat-insulating tube at interval in tune with the raised lines.

1 . A heat-insulating paper cup, which comprising:
 a cup body, which a conical cylindrical wall, a cup bottom and a cup rim;   a glued heat-insulating tube made of paper material; the inner wall of the heat-insulating tube is sleeved onto the exterior of the conical cylindrical wall of the cup body, and   the heat-insulating tube and the conical cylindrical wall of the cup body are adhered securely by glue W; the heat-insulating tube is of conical cylindrical shape and mated with the conical cylindrical wall; moreover, the external wall of the heat-insulating tube is configured to have a smooth surface;   multiple raised lines, protruded at interval onto the inner wall of the heat-insulating tube at an oblique angle, and mated with the conical cylindrical wall of the cup body;   multiple hollow ducts, set into the heat-insulating tube at interval and at an oblique angle in tune with the raised lines.   
     
     
         2 . The device defined in  claim 1 , wherein the heat-insulating tube is made of corrugated paper, so the corrugated inner layer of the corrugated paper is defined to form said raised line and hollow duct. 
     
     
         3 . The device defined in  claim 1 , wherein the raised lines are protruded at interval onto the inner wall of the heat-insulating tube at an oblique angle, and said hollow ducts are also configured to have an oblique angle in tune with the raised lines. 
     
     
         4 . The device defined in  claim 3 , wherein said raised line is extended obliquely from the top to the bottom of the heat-insulating tube. 
     
     
         5 . The device defined in  claim 3 , wherein said raised line is extended transversely into a wavy pattern between the top and bottom of the heat-insulating tube.